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Processing Nomex Nanofibers by Ionic Solution Blow-Spinning for Efficient High-Temperature Exhausts Treatment
Zekun Cheng1, Haiyang Wang1, Ziwei Li1
1State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084 China.
Advanced Fiber Materials
|December 19, 2022
Summary
A new ionic solution blow-spinning method enables scalable production of hard-to-dissolve Nomex nanofibers for high-performance air filters. These filters offer excellent efficiency and durability in high-temperature industrial applications.
Area of Science:
- Materials Science and Engineering
- Nanotechnology
- Chemical Engineering
Background:
- Hard-to-dissolve polymers offer superior chemical stability, mechanical performance, and high-temperature resistance for advanced filter materials.
- Mass production of these polymers in nanofiber form presents a significant fabrication challenge, limiting their widespread application.
Purpose of the Study:
- To develop a simple, scalable, and cost-effective method for producing hard-to-dissolve Nomex nanofibers.
- To evaluate the filtration performance and thermal stability of Nomex nanofiber filters for industrial air filtration.
Main Methods:
- Utilized an ionic solution blow-spinning technique to prepare Nomex nanofibers from a lithium chloride/dimethylacetamide (LiCl/DMAc) solution.
- Optimized the process to avoid issues associated with high electrical conductivity in traditional electrospinning, ensuring stable processing.
- Characterized the resulting Nomex nanofibrous membrane for filtration efficiency, pressure drop, and thermal resistance.
Main Results:
- Successfully produced Nomex nanofibers with an average diameter of approximately 100 nm via the ionic solution blow-spinning method.
- Achieved high filtration efficiency (99.92% for PM$_{0.3}$) with low areal density (4.6 g m$^{-2}$) and low-pressure drop (189.47 Pa).
- Demonstrated excellent flame retardancy and thermal stability, maintaining filtration efficiency at elevated temperatures (250-280 °C).
Conclusions:
- The proposed ionic solution blow-spinning method is a viable, scalable, and economical approach for manufacturing hard-to-dissolve nanofibrous filters.
- Nomex nanofibrous membranes exhibit superior performance compared to other materials like polypropylene and polyimide for high-temperature industrial air filtration.
- These filters are ideal for capturing particulate matter from high-temperature exhaust streams in various industrial settings.
